20968501 has 8 divisors (see below), whose sum is σ = 21359808. Its totient is φ = 20580000.

The previous prime is 20968499. The next prime is 20968511. The reversal of 20968501 is 10586902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 3-Lehmer number, since φ(20968501) divides (20968501-1)³.

It is a cyclic number.

It is not a de Polignac number, because 20968501 - 2¹ = 20968499 is a prime.

It is a deceptive number, since it divides R_20968500.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20968511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19426 + ... + 20476.

It is an arithmetic number, because the mean of its divisors is an integer number (2669976).

It is a Poulet number, since it divides 2^20968500-1.

Almost surely, 2^20968501 is an apocalyptic number.

It is an amenable number.

20968501 is a deficient number, since it is larger than the sum of its proper divisors (391307).

20968501 is a wasteful number, since it uses less digits than its factorization.

20968501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 20968501 is about 4579.1375825585. The cubic root of 20968501 is about 275.7544067823.

The spelling of 20968501 in words is "twenty million, nine hundred sixty-eight thousand, five hundred one".